Hi, I'd like to share that I found the solution to my problem in [1]. It was the config option "cache_images" in nova that is set to "all" per default. Despite changing the glance image properties of my images to raw it didn't prevent nova from downloading a local copy to /var/lib/nova/instances/_base. Setting "cache_images = none" disables the nova image cache, and after deleting all cache files in _base a new instance is not flat anymore but a copy-on-write clone like it's supposed to be. Sorry for the noise in this thread. :-) Have a nice weekend! Eugen [1] https://ask.openstack.org/en/question/79843/prefetched-and-cached-images-in-... Zitat von melanie witt <melwittt@gmail.com>:

On Fri, 12 Oct 2018 20:06:04 -0700, Remo Mattei wrote:

...

I do not have it handy now but you can verify that the image is indeed raw or qcow2

As soon as I get home I will dig the command and pass it on. I have seen where images have extensions thinking it is raw and it is not.

You could try 'qemu-img info <image>' and get output like this, notice "file format":

$ qemu-img info test.vmdk (VMDK) image open: flags=0x2 filename=test.vmdk image: test.vmdk file format: vmdk virtual size: 20M (20971520 bytes) disk size: 17M

[1] https://en.wikibooks.org/wiki/QEMU/Images#Getting_information

-melanie

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